But the North Sea's declining production can no longer be relied upon to meet demand (see chart).

ECONOMIST: Natural gas

The World Bank said on June 22nd that world-trade volumes, reeling from a drastic collapse in global demand (see chart), will shrink by nearly 10% this year.

ECONOMIST: A row with China points to fraying tempers

Even the Titans will only just keep pace with the demand for places (see chart).

ECONOMIST: Prison expansion

You see in your internal visualizer a chart of supply and demand, price and quantity, perhaps depicted as a large X on a graph with two axes.

FORBES: Your Brain Was Made For Visual Modeling

Only then would demand in Germany begin to rise to match the booming demand for German exports (see chart), which has persisted even while the rest of the economy is in the dumps.

ECONOMIST: Germany's export champions

The supply of skilled workers has failed to keep pace with demand, so the college wage premium (see chart) has increased.

ECONOMIST: The middle-class task- force

The chart shows pretty clearly that China is now key to foreign demand for American logs.

FORBES: Forecast for the Wood Products Industry, 2013

The chart illustrates how developing (non-OECD) country oil demand has dramatically increased since the mid-1990s while developed world (OECD) demand has decreased.

FORBES: Chinese Demand Remains The Driver Of World Oil Prices And That's Bullish

But look out: Demand for SUVs, while still very strong, is flattening (see chart, below), while overall light-truck plant capacity is still growing fast.

FORBES: Magazine Article

On the demand side, in the past couple of months sterling has risen again against the euro (see chart), and therefore may be squeezing exports once more.

ECONOMIST: The economy